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Physics
A geo-stationary satellite orbits around the earth in a circular orbit of radius 36000 km. Then , the time period of a spy satellite orbiting a few hundred kilometers above the eart's surface(R_earth = 6400 km) will approximately be (a)(1/2)h (b)1 h (c)2 h (d)4h
Chemistry
Multiple -choice question Isomers which can be interconverted through rotation around a single bond are (A)conformers (B)diastereomers (C)enantiomers (D)positional isomers.
Mathematics
In a triangle ABC, AD is perpendicular to BC and DE is perpendicular to AB. (1) Area of ADB (a) (b² / 4) sin 2C (2) Area of ADC (b)(c ² / 4) cos ²B sin 2B (3) Area of ADE (c)(c ² / 4) sin 2 B (4)Area of BDE (d)(c ² / 4) sin² B sin 2 B

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